US5132495A

US5132495A - Submersible splice cover with resilient corrugated and sections

Info

Publication number: US5132495A
Application number: US07/644,768
Authority: US
Inventors: Jack C. Ewing; J. William Venezia
Original assignee: Homac Manufacturing Co
Current assignee: ABB Installation Products International LLC
Priority date: 1991-01-23
Filing date: 1991-01-23
Publication date: 1992-07-21
Anticipated expiration: 2011-01-23

Abstract

A splice cover adapted for use with a submersible splice and interconnecting insulated cables comprising a resilient substantially cylindrical center section and resilient corrugated end sections. The corrugations provide interior and exterior grooves and ridges which permit expansion and extension of the end section so as to accept different size insulated cables while maintaining a watertight fit between the cover and the insulated cable and an interference fit between the splice and the splice cover.

Description

This invention relates generally to splice covers and more particularly to submersible splice covers which provide watertight insulation.

BACKGROUND OF THE INVENTION

Underground residential electric and distribution systems have primary and secondary voltage cables direct buried in trenches, usually at curbside. To maintain the watertight integrity of these systems, all cable connectors, including splices, are insulated watertight.

Advances in elastomer technology have generated the development of insulated splice covers which are now in common use. They have largely eliminated the use of tape and various compounds for insulating splices because of the considerable installed costs for these systems. The use of these splice covers substantially reduces such costs. Splice covers have also been applied over splices and cables by heat shrinking. This not only requires expensive equipment at the site, but also means that the cover must be destroyed in order to have access to the splice. Accordingly, elastomeric splice covers which are slidable along the cables and the splice itself are now in use. These provide watertight integrity about the cable insulation and an interference fit between the cover and splice so as to enhance heat dissipation.

The splice assemblies that are the subject of this invention are generally for use on cables rated up to 600 volts. A typical splice cover has a watertight fit about the cables where the ends of the splice cover meet with the cables. As is generally the case at the present time, the ends of these splice covers include circular ribs within the ends so as to enhance the watertight integrity of the splice. One problem inherent with this type of splice is that while the splice itself is flexible, the ends are not expandable to any degree and, therefore, a specific splice must be used for a specific size cable.

Accordingly, it is an object of this invention to provide a splice cover having ends which provide both radial expansion and longitudinal extension.

A further object of the invention is to provide a splice cover which can accommodate more than one size of cable while maintaining the watertight integrity of the fit about the cable insulation and an interference fit between the splice and the cover.

These and other objects of the invention will become obvious from the following description taken together with the drawings.

BRIEF SUMMARY OF THE INVENTION

The invention provides a splice cover adapted for use with a submersible splice and interconnecting insulated cables which comprises a resilient substantially cylindrical center section and resilient and extensible corrugated end sections. The resilient center section is preferably of a dimension which provides an interference fit with the splice. The corrugated end sections include interior and exterior parallel grooves and ridges. These grooves and ridges permit radial expansion and longitudinal extension of the area of the cover which encloses the cable insulation. The resulting cover permits use of various size insulated cables, providing watertight integrity about the cable insulation while maintaining an interference fit between the splice and the splice cover.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side elevational view of one embodiment of the present invention;

FIG. 2 is a sectional view taken along the lines 2--2 of FIG. 1;

FIG. 3 is an enlarged view taken along the lines 3--3 of FIG. 2;

FIG. 4 is a side elevational view of a further embodiment of the present invention; and

FIG. 5 is a partial sectional view of the embodiment of FIG. 2 installed about an insulated cable and splice.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 discloses a flexible splice cover having a central configuration similar to that disclosed in U.S. Pat. No. 4,959,508 issued Sep. 25, 1990. That particular splice cover includes a central recess which mates with an exterior rib about a splice. This configuration provides a means for centering the splice and maintaining an interference fit between the splice and the cover.

Splice cover 11 has two

body sections

13 and 15 interconnected by central recess section 17. The splice terminates at its ends in corrugated sections 19 and 21. In this particular embodiment, the corrugated sections are connected to the central sections by means of tapered sections 23 and 25. The splice cover is molded of a resilient material such as an elastomer. This material is now well known in this art and is used to provide watertight covers for underground splice apparatus.

Turning to FIG. 2, it can be seen that the corrugations on either end are substantially identical. Each corrugation, such as corrugation 19, includes

outer ribs

26 and 29, which alternate with outer grooves 27 and 31. The inner portion of the end of the splice includes

grooves

32 and 35, which alternate with

ridges

33 and 37. All the grooves and ridges are substantially parallel to each other and are located such that the grooves in the outer surface lie in substantially the same plane as the ridges in the inner surface and vice versa.

When tapered section 23 is used, diameter D2 of the outer ribs is less than the outer diameter D1 of center cylindrical section 13. The relative diameters are indicated as D1, D2, D3, and D4. This structure provides a cover which can accommodate substantially different size insulated cables while maintaining the watertight integrity between the cable insulation and the cover. Thus, cables having different predetermined diameters may be used with this cover. Regardless of the size of the cable, so long as it is within the predetermined limits,

inner ridges

33 and 37 ensure watertight integrity between the insulated cable and splice cover. It is to be understood that a cover without the tapered sections may be used and still maintain the interference fit and watertight integrity provided by the corrugated end section of the present invention so as to accommodate a limited number of cable sizes. The use of the tapered section is preferable since it reduces the size of the air pocket, thus increasing heat transfer.

EXAMPLE FIGS. 1 and 2

An example of a satisfactory splice cover, the cover illustrated in FIGS. 1 and 2, has the following dimensions:

______________________________________                                    
          D1 = 0.812 Inch                                                 
          D2 = 0.688 Inch                                                 
          D3 = 0.500 Inch                                                 
          D4 = 0.360 Inch                                                 
          D5 = 0.625 Inch                                                 
          L1 = 5.5.sup.   Inches                                          
          L2 = 1.634 Inches                                               
          L3 = 0.750 Inches                                               
______________________________________

The tapered section has an angle from the horizontal of 8°.

FIG. 3

______________________________________                                    
          D1 = 0.812 Inch                                                 
          D2 = 0.688 Inch                                                 
          D3 = 0.500 Inch                                                 
          D4 = 0.360 Inch                                                 
          D5 = 0.625 Inch                                                 
          L1 = 5.5.sup.   Inches                                          
          L2 = 1.634 Inches                                               
          L3 = 0.750 Inches                                               
______________________________________

Referring to FIG. 3, the distance L4 between parallel grooves and parallel ridges of 0.187 inch, and the distance L5 between the outer ridge and the outer groove is 0.078 inch. The angle between the side walls of the grooves is 45°.

Referring to FIG. 4, there is shown a splice cover 41 which has a constant diameter throughout its central length but at its ends terminates at

corrugations

43 and 45, which are connected to the central section by tapered edges 47 and 49 in substantially the same manner as that disclosed for the factor of FIGS. 1 and 2.

Referring to FIG. 5, there is shown a partial sectional view of splice cover 70 of the present invention in place about insulated cable 71 and splice 73. The main body of cover 70 is shown in an interference fit about splice 73. Splice cover 70 terminates in

ridges

56, 59, 63 and 67 and

grooves

57, 58, 64 and 68. As will be evident, interior ridges 63 and 67 are slightly flattened and the corrugated section extends further in length over the insulation of cable 71. The expansion and extension of the ridges ensures a watertight configuration. While additional grooves and ridges may be used, it has been found that the configuration having two internal ridges provides the required watertight integrity.

It is to be understood that the above description and associated drawings are descriptive only, since modifications could occur without departing from the invention, the scope of which is limited only by the following claims.

Claims

We claim:

1. A splice cover adapted for use with a submersible splice and interconnecting insulated cables, said splice cover comprising

a resilient substantially cylindrical center section;

resilient corrugated cylindrical end sections having an interior diameter D3, said end sections having a plurality of interior and exterior grooves and ridges, the exterior grooves lying in substantially the same cross-sectional plane as the interior ridges and the exterior ridges lying in substantially the same cross-sectional plane as the interior grooves;

said interior ridges having an interior diameter D4, diameter D4 being less than diameter D3;

whereby said corrugated end sections and the associated interior ridges are radially expandable and longitudinally extensible so as to accept cables of different diameters while maintaining watertight integrity between the insulated cables and the interior ridges of the corrugated end sections.

2. The splice cover of claim 1 wherein each of said corrugated end sections comprises at least two internal and external grooves and ridges.

3. The splice cover of claim 1 further comprising

resilient tapered cylindrical sections interconnecting said center section with said end sections.

4. The splice cover of claim 1 wherein said center section and said end sections are of a single unitary molded elastomer.